Caio: Name Meaning, Origin & Popularity

At a Glance: Name: Caio – Meaning: traditionally glossed as 'rejoice' (as a Portuguese form of Gaius), though the ultimate origin of Gaius is uncertain – Origin: Portuguese (from Latin Gaius) – Gender: Boy – Pronunciation: KY-oh


Caio is a Portuguese (from Latin Gaius) boy's name meaning “traditionally glossed as 'rejoice' (as a Portuguese form of Gaius), though the ultimate origin of Gaius is uncertain”. It appears in 6 of our baby name lists.

Meaning & Origin of Caio

Meaning: Traditionally glossed as 'rejoice' (as a Portuguese form of Gaius), though the ultimate origin of Gaius is uncertain.

Origin: Portuguese (from Latin Gaius).

A common claim: Widely said to mean 'rejoice.' Actually: 'Rejoice' is the traditional gloss for Gaius-derived names in most baby-name references; scholars note the actual root of Gaius is uncertain, so treat this as a traditional rather than certain meaning.

Source: Wiktionary.

How to Pronounce Caio

Phonetic: KY-oh   IPA: /ˈkaɪoʊ/

Popularity of Caio

Source: U.S. Social Security Administration birth-name data, 1990–2024.

Lists That Include Caio

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